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the sum of dissolved elementary chlorine, hypochlorite, hypochlorous acid, dissolved elementary bromine, hypobromite, and hypobromic acid, measured together and expressed as cl2
summen af opløst elementært chlor, hypochlorit, hypochlorsyrling, opløst elementært brom, hypobromit og hypobromsyrling, målt samlet og udtrykt som cl2